This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 90 |
| 4 | 1428 |
| 5 | 10600 |
| 6 | 51525 |
| 7 | 190806 |
| 8 | 584080 |
| 9 | 1552608 |
| 10 | 3701025 |
| 11 | 8088850 |
| 12 | 16470036 |
| 13 | 31616520 |
| 14 | 57743413 |
| 15 | 101055150 |
| 16 | 170433600 |
| 17 | 278290816 |
| 18 | 441610785 |
| 19 | 683206218 |
| 20 | 1033218100 |
| 21 | 1530887400 |
| 22 | 2226630021 |
| 23 | 3184447750 |
| 24 | 4484709648 |
| 25 | 6227340000 |
| 26 | 8535450625 |
| 27 | 11559457026 |
| 28 | 15481719540 |